Alarm whistle



G. F. HALL.

ALARM WHISTLE.

Arrucmon msn ocr. s. |92.

1,436,876, mma Nov. 2s, 1922.

INvi-:NTOR @ifm Patented Nov. Z8, 1922.

UNITED STATES 1,436,876 PATENT OFFICE.

GEORGE F. HALL, OF NEWARK, NEW JERSEY, ASSIGNOR T0 ROLAND J'. HINES, 0F NEWARK, NEW JERSEY.

ALARM'. WHISTLE.

Application led October 5, l1921.

To all whom it may concern:

Be it known that I, GEORGE F. HALL, a citizen ot the United States, and a resident of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Alarm Whistles, oi' which the following is a specification.

This invention relates to an improved whistle which is of the type used on internal combustion engines, the exhaust gases Jfrom the engine being utilized to pass through the whistle to cause the sounding of it.

The invention is designed to provide a Whistle of this kind which is easily assembled and which is easy ot access to the parts of the device for cleaning and repairing, and is one in which a chime effect is secured by reason of the construction of the core of the whistle.

The invention is illustrated in the acc-ompanying drawing, in which Figure 1 is a side View of a whistle made according to my invention, Figure 2 is a central vertical section of the whistle shown in Figure 1. Figure 3 is a section on line 3-3 in Figure 1, and Figure 4 is a section on line 4-4 in Figure 2.

I'Ihe whistle comprises a core which is usually cast and comprises a central stem 10 and radial partitions 11 which are of substantially the same length and abut on their outer edges on the shell 12 which surrounds the core and thus forms chambers between the partitions, which chambers can be provided with horizontal partitions 13, the horizontal partition in one chamber being at a 'diierent height than the partition in the other, so that a diierent note is sounded in each of said chambers, so that a chime effect can be secured when the whistle is blown.

Means at the top for embracing the shell is provided, in the form shown this comprising a top plate 14 which is preferably secured by means of the screws 15 which pass through the top plate and into the top edges of the partitions. l arrange the diaphragm 16 at the bottom ot the core, and it is held in place against the bottom or' the partitions by a valve casing 17, which valve casing is preferably fastened in place by screwing it on the reduced extension 18 of the core.

The top part of the valve casing is made in the form of a spider with the arms 19,

Serial No. 505,614.

as will be evident from Figure 4, these arms tightly holdinor the diaphragm against the bottom edges o the partitions, the diaphrag being slightly smaller in diameter than the inner wall 2O oi' the valve casing so as to form the circular opening or air passage 21, and adjacent thereto I make the shell short-er than the core so as to provide the openings 22 beneath the shell, the partitions having shoulders 23 against which the bottom end of the shell rests.

I prefer to make the valve casing in two members, the lower member 24 screwing on the upper member 17 so as to give easy access to the valve seat 25 on the boss 26 of the member 17 the valve seat 25 being adapted to be closed by the valve 27 which has a stem 28 which extends up through the chamber 29 of the valve casing, through the stem of the core 10 and beyond the to plate. The lower member 24 is screwed on the boss 26 and has a perforated screw-threaded boss 24 vtor its attachment to the cylinder of an engine.

The valve is normally held shut by the spring 30 which is arranged in the recess 31 in the top part of the core and abuts at one end on the bottom of the recess and at the other end against an element secured to the stem.` which element is preferably an adjustable nut 32 which screws on the screwthreaded end 33 of the stem.

In order to provide a good finish I usually place a small dome 34 on the screw-threaded end ot the stem which receives the thrust of the element that is to push the stem to open the valve. In the drawing this element comprises a lever 35 of the bell-crank type which is pivoted, as at 36, to the ears 37 of the top plate and has an arm 38 to engage the end of the valve stem, and has an arm 39 which receives a strand or wire 40 which extends to the dashboard of the vehicle and is pulled when the alarm is to be sounded.

I claim:

A whistle comprising a longitudinally erforated core having radial partitions, a valve casin comprisingtwo members, the upper mem er being screwed at its center on the end of the core and engaging the core at its outer edge, a diaphragm clamped by the upper member of the valve casing to the lower face of the core, a shell surrounding the core, a top plate secured to the partitions angiengaging the shell, the upper mei'nber of the vaive easing having aiL boss :it the bottom, the boss having a valve seat on its bottom face, a valve seating on said seat, a valve stemsecurec to the valve and passing' through the perforation in the core and emerging' through the top plate, lever pivoted on the top plate and adapted to be pressed against the top end of the valveL stem, and a lower vielveV screwing on the boss oi the ilpnerfmember and havingr a screw-threaded boss for the attachment of the device to the cylinder of an engine.

In testimonyv that I I have hereto set my hand, this 1st day of October, 1921.

GEO. F. HALL.

erasing, member 10 claim the foregoing, 15 

